The notion that people sometimes seek out extremely stimulating situations and activities is most likely to be proposed by a proponent of the theory of motivation.

Arousal Theory of Motivation

People generally experience different levels of motivation in their day-to-day lives. In the Arousal Theory of Motivation, every person is motivated or driven to do things to maintain his/her "optimum" level of "arousal." These are often affected by environmental factors or stimulation. 

When a person's arousal levels are low, such as when they are bored, they tend to seek thrilling or energizing situations (e.g. going for an adventure, a night-out, skydiving, etc.) to elevate their levels of arousal and energize. However, if a person's level of arousal goes too high above the optimum, he/she begins to feel stressed and would then seek relaxing activities such as napping, reading an entertaining book, or maybe watching TV. 

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glass wants to live in a world of super heroes and villains. he have lived all his life trying to be responsible for the creating the origin story of a super hero; he schemed and caused many incidents (many of them fatal) hoping that someday someone with superpowers would show up and save the day.

he knew himself very much. he saw himself as a villain of a real-life super hero story. he was aware of his strengths (more than smart enough for being manipulative and scheming) and weaknesses (having fragile bones and having to rely on his mind to succeed).